Does it work for you if you remove the double slash before plugin in the url?

In fact, this url works : http://reverse-proxy//plugin/build-failure-analyzer/images/48x48/information.png but url image is http://computer_name:8080//plugin/build-failure-analyzer/images/48x48/information.png and anonymous have no right on this url for security management.

Ok, I hoped the slashes would have something to do with it but it seems to be 2 different problems then.

The plugin uses getRootUrlFromRequest() ( http://javadoc.jenkins-ci.org/jenkins/model/Jenkins.html#getRootUrl() ) for getting image base url but I read in jenkins api documentation this method is not compatible with reverse proxy whereas I believe getRootUrl() ( http://javadoc.jenkins-ci.org/jenkins/model/Jenkins.html#getRootUrlFromRequest() ) works with a reverse proxy.

Please any ideas ? I really want to use your plugin !
thanks

By using getRootUrl, we got problems with users using a context path which isn't the root. We will look into the problem and see if we can find something which works for everyone.

I came up with solution that works for most cases. The one case it won't work is when you are running behind a reverse proxy and don't fill out the Jenkins URL in settings. getRootUrl() uses getRootUrlFromRequest() as a fallback if the field is left blank, but since it doesn't work behind reverse proxy we won't be able to find out the rootUR. Make sure to fill out the field

I will try to release the fix as soon as I can.

Great, the field is already filled.
Thanks !

Commit: e4f7fb996be928c5fdb236a78e67e4350fcd512f